ELECTROQUENCHABLE PHOSPHOR INVESTIGATION
Abstract
Research was devoted to the investigation of electrophotoluminescent effects in phosphors and the development of techniques leading to the utilization of these effects in useful display devices. It is shown that efficient electroquenchable (EQ) cells can be made, using evaporated phosphor films and solid contacts. The phosphor films themselves have a very high photoluminescent efficiency, and may have future use as high resolution screens in cathode-ray tubes, etc. Very high efficiencies, as far as quenching is concerned, were measured. The theoretical current required for complete quenching of a phosphor having 10 ft-Lamberts of brightness is 7.5 microampere per sq cm if the phosphor is 100% efficient. Current corresponding to approximately 100 microampere sq cm was measured on some cells. The switching speed of these cells can be high. Switching speeds were measured by controlling a cell with a 60-ohmper-square-wave voltage. The cells measured were completely quenched in less than 20 microseconds, and reached their full brightness in less than 20 microseconds after the quenching voltage was removed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 28, 1961
- Accession Number
- AD0268932